Linux服务器配置---安装telnet

[root@localhost wj]# rpm -qa | grep telnet

[root@localhost wj]# yum install -y telnet-server   //telnet服务器端，允许其他电脑连接

Installed:

  telnet-server.i686 1:0.17-48.el6                                                                                          

Complete!

[root@localhost wj]# yum install -y telnet      //telnet客户端，可以连接其他电脑

Installed:

  telnet.i686 1:0.17-48.el6                                                                                                 

Complete!

[root@localhost wj]#gedit /etc/xinetd.d/telnet

 # default: on

# description: The telnet server serves telnet sessions; it uses \

#   unencrypted username/password pairs for authentication.

Service telnet

{

    flags      = REUSE

    socket_type   = stream        

    wait       = no

    user       = root

    server     = /usr/sbin/in.telnetd

    log_on_failure    += USERID

    disable       = no  //这个默认是yes，只有改成no才可以启动telnet

}

[root@localhost wj]# gedit /etc/service 

telnet          23/tcp     //为了防止被攻击，一般都不会使用23端口。注意这里的23端口要使用tcp和udp两种协议

telnet          23/udp 

[root@localhost wj]# gedit /etc/sysconfig/iptables

-A INPUT -m state --state NEW -m tcp -p tcp --dport 23 -j ACCEPT

-A INPUT -m state --state NEW -m udp -p udp --dport 23 -j ACCEPT

[root@localhost wj]# service iptables restart

iptables：将链设置为政策 ACCEPT：filter nat                [确定]

iptables：清除防火墙规则：                                 [确定]

iptables：正在卸载模块：                                   [确定]

iptables：应用防火墙规则：                                 [确定]

iptables：载入额外模块：nf_conntrack_ftp                   [确定]

[root@localhost wj]# service xinetd restart        //telnet依赖xinetd

停止xinetd：                                             [确定]

正在启动xinetd：                                          [确定]

[root@localhost wj]# telnet 192.168.0.119

Trying 192.168.0.119...

Connected to 192.168.0.119.

Escape character is ‘^]‘.

CentOS release 6.5 (Final)

Kernel 2.6.32-431.el6.i686 on an i686

login: david

Password: 

Last login: Thu Aug 16 08:24:19 from 192.168.0.119

already login